Pictures: Details: Compact Geiger Muller tube, the SBM-20M shows an excellent sensitivity for its small size. It was designed for hard beta and gamma radiation, and the particular tubes in my photos above are new generation tubes, manufactured in 2012. This is similar to the SBM-20-1, but smaller. Notes on sensitivity: The sensitivity of this tube is comparable with the SI-29BG and the SBT-9. Its small size makes it ideal…
Pictures: This is a rare Geiger Muller tube with a mica end window that allows it to detect alpha, beta and gamma radiation. It is a good substitute for the LND712 (both pictured above) where a multi-radiatin type detector is required, yet its low availability makes it problematic for any developing project (see uRADMonitor-D). This source indicates the SBT-9 was used in Russian spacecraft: “Vernov and his associates frequently used…
Pictures: An excellent miniature mica window Geiger tube, suitable for detecting Alpha, Beta and Gamma radiation. As of 2015, it was selected for the uRADMonitor D series of radiation detectors. Details: Halogen quenched Geiger Muller tube, with a Mica end window making it suitable for detecting alpha beta and gamma radiation. Notes on sensitivity: The sensitivity of this miniature Geiger tube is amazing, placing it closeto the larger SBM-20. Most…
The SBM-21 Geiger tube offers relatively good sensitivity especially when compared to its ultra compact size.
The STS-5 is a geiger tube for hard beta and gamma detection, manufactured in USSR in the 60’s, similar in specs to the newer SBM-20.
SI-3BG Geiger tube is suitable for detecting high radiation doses, but finds little use in DIY applications.
Pictures: Details: The SI-22G is a highly sensitive hard beta and gamma radiation detector tube, made in USSR during the 80’s for the Soviet Military Needs by the Soviet Institute for Scientific Radiation Technology Research. Notes on sensitivity: This is a highly sensitive tube, thanks to its cathode material and relatively large size. It is perfect for monitoring equipment and DIY dosimeters, superior to the SBM-20 in this sense. The…
The SI-29BG comes with a good size / sensitivity ratio. These tubes are suitable for detecting beta and gamma radiation.
The SI12B is a mica window compact Geiger tube, designed for measurement of alpha and soft beta-radiation.
The Svetlana GP-5 (ГП-5) is a glass-envelope beam power triode intended for use as a shunt regulator or pulse modulator in high-voltage systems.
5J29 is a split anode magnetron. This device is water cooled, the water flowing round the metal loop.
Some of these tubes contain small quantities of Cesium-137, Cobalt-60, Radium-226, Krypton-85. The radioactive elements have been added to increase the electronic response by improving the internal ionization processes.
A story of making a DIY Digital Geiger counter circuit, that can be used with several tubes. Add an enc28j60 Ethernet module and use the data to create graphs available online!
The device consists of a hot cathode (filaments), anodes (phosphor) and grids encased in a glass envelope under a high vacuum condition. The cathode is made up of fine tungsten wires, coated by alkaline earth metal oxides, which emit electrons when heated by an electric current.
A hydrogen thyratron is a device capable of switching big amounts of energy. The major advantage over other thyratrons is that the deionization time is reduced by using the hydrogen gas, generated in a small reservoir inside the tube, from a metallic Hydride.
An article on Thyratrons and a film showing three energized tubes : the 714, the 309/FG17 and the ELC1B.
EM-11 is a magic eye tube, used in old radios for tunning. See some schematics on how to use this tube, for some green, fluorescent effects!